We present an a priori study of the dynamics of the exothermic reaction C( 3P)+SH(X 2Π)→ CS(X 1Σ +)+H( 2S) at 300 K by means of the quasi classical trajectory method. Unusual behavior of the dynamics of this reaction is noticed, especially for the vibrational distribution of CS. The presence of two topologically different potential wells associated with highly bent CSH and SCH geometries along the reaction path creates a bimodal inverted distribution of the population of the vibrational levels of CS(X 1Σ +). This bimodal distribution is closely connected to the existence of two kinds of reactive trajectories. The direct ones pass through the shallow CSH well only and lead to a high vibrational excitation of CS. The other trajectories present a more complicated motion in both wells, the SCH well being 40 kcal/mol deeper than the CSH well. This complicated motion, associated with long lifetimes of the intermediate, favors some redistribution of the energy into the rotational motion of the triatomic complex and consequently into the rotation of CS. However, since the rotational energy of CS is a small fraction of the total energy of the reaction, the change of the vibrational motion concerns mainly the relative translational motion. The weaker the vibrational excitation of CS, the larger the recoil velocity of H with respect to CS. Finally, we propose a value of the reaction rate k(300) in the range of values usually encountered for gas kinetic rate constants, taking into account the electronic partition function ratio.